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In Pictures: Fabulous space photos from NASA’s Hub...
NASA said blue is typically an indicator of hot, young stars. In this case, however, the stellar oddities are aging, sun-like stars that have prematurely cast off their outer layers of material, exposing their extremely blue-hot cores. NASA said a astronomers were surprised when they spotted these stars because physical models show that only an unusual type of old star can be as hot and as bright in ultraviolet light.
In Pictures: Fabulous space photos from NASA’s Hubble telescope